If you want to use a picture as your signature, first upload the picture you want to use as your signature, and there will be a file similar to "UploadFile/2005-6/200561612213773467.gif" path, then you copy this path and add it before and after the path. For example, my signature is ["img]UploadFile/2005-6/200561612213773467.gif[/img"]. Please be careful to remove it. Double quotes!